enhance: remove redundant check and improve efficiency #599

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	4m 42s
test (x86_64-unknown-linux-gnu, nightly)	4m 40s
test (i686-unknown-linux-gnu, stable)	3m 43s
test (i686-unknown-linux-gnu, nightly)	3m 36s
test (aarch64-unknown-linux-gnu, stable)	2m 52s
test (aarch64-unknown-linux-gnu, nightly)	2m 45s
test (armv7-unknown-linux-gnueabihf, stable)	2m 47s
test (armv7-unknown-linux-gnueabihf, nightly)	2m 45s
test (riscv64gc-unknown-linux-gnu, stable)	2m 52s
test (riscv64gc-unknown-linux-gnu, nightly)	2m 44s
test (s390x-unknown-linux-gnu, stable)	2m 57s
test (s390x-unknown-linux-gnu, nightly)	2m 43s
test (x86_64-apple-darwin, stable)	4m 7s
test (x86_64-apple-darwin, nightly)	4m 46s
test (aarch64-apple-darwin, stable)	3m 4s
test (aarch64-apple-darwin, nightly)	3m 28s
test (x86_64-pc-windows-gnu, stable)	3m 39s
test (x86_64-pc-windows-gnu, nightly)	3m 36s
test (x86_64-pc-windows-msvc, stable)	5m 4s
test (x86_64-pc-windows-msvc, nightly)	4m 28s
test (i686-pc-windows-gnu, stable)	6m 56s
test (i686-pc-windows-gnu, nightly)	6m 43s
test (i686-pc-windows-msvc, stable)	3m 34s
test (i686-pc-windows-msvc, nightly)	3m 19s
	1h 31m 50s

Provide feedback